<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

</body>
<script>
    // var x = confirm("我帅不帅！");
    // console.log(x);
    // do{
    //     var y = prompt("我帅不帅？");
    // }
    // while(y!="帅");

    for (var i = 1; i <= 6; i++) {
        for (var j = 1; j <= 6 - i; j++) {
            document.write("&emsp;");
        }
        for (var k = 1; k <= 2 * i - 1; k++) {
            document.write("星");
        }
        document.write("<br>");
    }
    for (var i = 5; i >= 1; i--) {
        for (var j = 1; j <= 6 - i; j++) {
            document.write("&emsp;");
        }
        for (var k = 1; k <= 2 * i - 1; k++) {
            document.write("星");
        }
        document.write("<br>");
    }
</script>

</html>